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28 October, 09:46

In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. 2 A ⟶ 3 B How many molecules of substance B are produced when 29.2 g of substance A reacts? The molar mass of substance A is 25.6 g / mol. Step 1: Convert the mass of A to moles. moles of A: mol Step 2: Convert the number of moles of A to the number of moles of B. moles of B: mol Step 3: Convert the number of moles of B to molecules of B. molecules of B:

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  1. 28 October, 11:45
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    There will be produced 1.71 moles of B which contain 1.03*10²⁴ molecules

    Explanation:

    The example reaction is:

    2A → 3B

    2 moles of A produce 3 moles of B

    If we have the mass of A, we convert it to moles and then, we make the rule of three: 29.2 g / 25.6g/mol = 1.14 moles

    Therefore 2 moles of A produce 3 moles of B

    1.14 moles of A will produce (1.14. 3) / 2 = 1.71 moles of B are produced

    Now we can determine, the number of molecules

    1 mol has NA molecules (6.02*10²³)

    1.71 moles have (1.71. NA) = 1.03*10²⁴ molecules
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